If a new standby CPM is inserted into the system, it synchronizes with the active CPM upon a successful boot process.
If the standby CPM is rebooted, it synchronizes with the active CPM upon a successful boot process.
When configuration or state changes occur, an incremental synchronization is conducted from the active CPM to the standby CPM.
If the synchronization fails, the standby does not reboot automatically. The show redundancy synchronization command displays synchronization output information.
If the active and standby are not synchronized for some reason, users can manually synchronize the standby CPM by rebooting the standby by issuing the admin reboot standby command on the active or the standby CPM.